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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2237d7e3cb0a05d43625771b2a4bd1515b3ee01ba9b1529cb8880635a70b78d4' 
  AND token = '/KXNChf2vkqyKSuBCc4DUnYad5yb56k6Bqq98bVW9es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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