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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a12125075ace24ae002e7319ac1c65d50292a1b336689d607d93efe28600d6d' 
  AND token = 'U2ZqI0o47eN4+UmFe46S82Jnz6rlhQ4vxktp1yGyyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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