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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c5ed0bcde953c2785f62b185d716fd6911687012a3edc35450466ded77adf' 
  AND token = 'c62OCh5uvw9OeGp7hN53iivCDGyIJsl+arG/aJDfhlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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