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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5787462755ee970ed84a58776d40a90ea27b4fd593a0fdf0d56e722aa86c2d9a' 
  AND token = 'YlaEj1xMHlsr2d8FqQq8ukl8rrKkv5TDd+FN2PUwsxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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