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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a35190a32a65a5aa1fa8a65124bdf63f33f8a2e199c6597e2b2c0139cb9f8a' 
  AND token = 'OPGtDe4aOL97+3Q+hZBzWsld/adltez7HsbjAsDRHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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