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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86201d44b545c653b3afc363560335e2a693bcdc435ce4b77165cf6ea2823d6' 
  AND token = 'nqk1M5z8TYdDziuez1MBPnigQEuRe3wASebUXJcXFKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}