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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c93c3aba9d43174d5a857352bf467efbaf54607564c1aa15077e6897bb8412' 
  AND token = 'uS2bXGAuJn8wwnraBhwMPBfq05p11mB90dtLCnMYnuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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