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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc026b2eb45f67bb15eade69614535d5eac553b193249c6d78290853a744874' 
  AND token = '4YmR8lS2Wd0nY4JhsmmYDPYOHFHAwReHB7XI3RIGsSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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