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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641ca2dc269a740cde576979503b1be8f4c5c9126c3e2a8a617c2fc98951c8f5' 
  AND token = 'TAII6QiBS4TmLw9c2g5cOyAjaqBrfx0DQvnKowRa56s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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