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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f3dd6529aa7bd83336ccf1b2ef892b68179c75d04924f66c3bf96071ad76ce' 
  AND token = 'XbchP+fHTcXxtSiKaRRMSxvrGrLH1htwBk3vbo972GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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