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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bdd5a6e614a0e919c5bb1b7d460dbefb5c2aca11b6b3eacf91d5a36a29270e' 
  AND token = 'yUhjBAYP1Up8QbEljPZEwXjSai+k7+ZK3Ds0w/uTXFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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