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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0abfe3553b719d3454d9563079db826aa324c4843bab006e66dc0a24980419' 
  AND token = 'CjxqwUpNTsb1x11vtMJvB2PlXQD5Yzt93PRrFcTi4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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