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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e17a4039c7fe27b92b21634042f6deed29a00b7717e5691fce61735ea3c0fcf' 
  AND token = 'oW+NEc4ooIPxuR4e59+jJslplrHhZZTyemh9vjhOtIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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