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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c099497ba47062fa4b46314647e9236e300a12c424fec8b17f08ce23235f4ee8' 
  AND token = 'EQ+yq3rEJctZW++SNq7Y85sdzTebv+y9q9X8haueokc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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