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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67319619ee3e4ea37aa8ba3d752adfffaf60e96a19eaa0096bf85b06635341f8' 
  AND token = 'JWl3Eozk+UALtK/iihVqb7vMDac0vVYLK7d0PRET0xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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