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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32d662f07bc818f16fdb2cf03bc4f11b40f67c4186789ec96a300e248795e2c' 
  AND token = '03ZdgRUArLpPrxYikMPYqvVqxpRmnPSYaxmv3Dj90mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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