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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a729caceff0eeac456fef1a96246776047d70297901d22707ebd042e6b398f3' 
  AND token = '8RpNH3uX0eiCxs6RHkt6lcn1BvkBaOLW89pGdjpwq44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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