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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8153ae446020e34d22b072009234edc8382545e096946ea6ab2a6d489c9ba0d' 
  AND token = 'LU1yj+JlirepL5+klPNr1kpN26CuERjIl68NNGFITe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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