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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e6f6db6a179a18e6b8577221f9a6e58c44a4678841e5506f387c390ac4d986' 
  AND token = '0m4VJ+BJeIm3nymqKykHetA2kRfixYU3VqRx0sFlMPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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