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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95370c73b659c3af9433b07ba04d133e1b6b3b165fa7a794c51d8fbccb25ee72' 
  AND token = '+5lLfoIWeAx4l31T2qv7AqStMNak6rOaRz89tb++hvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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