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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91b2c14833e548cd6ce5200824e075285cedfb66fd1f2f4caeb57f61e08476e' 
  AND token = 'BaTXGm6dcfsei1spkeTmiiPkcI+ZnoxbVaFmR0N/vyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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