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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277d3e62d1d5f0754bc9f5ad138a519e090155ec6bb185c88bc2bb58f017050f' 
  AND token = 'e8QnGKTaI1dTYWcGOAy2plPEdfxf82jmR8UoDktLZjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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