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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dbd05b7f4e65c3f3a9005c1b29a959e83f309b0c269cc3bba21c8ce68e5db6' 
  AND token = '1IOwy0Q1aSVhOw56uJeDHiAOAIyFIICz5VStKMJjxJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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