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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e971e8ea61e18f42d6e61ede053b082b580be4b4bb98c6471eaee04e5121cdf' 
  AND token = 'OEozeVWNXoGylWcBt+L9ek/2UF9CVsprfTIu6tEFs9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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