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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcee46e6e5e6bb79b0ff67b82405221dc144e284cf38e162b535f02cc896dfa' 
  AND token = 'FfTNH9lHF2b1KHeeTeQ7Z8CgxEU8OfxOs1pm0Eb/EL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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