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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb12948da10d0773a81bcf7a22d7dfeb23e4206305cfa1d1219fb762f8a38177' 
  AND token = 'vQQzf3px6pOGG1M8lsFQs50Yfg6xNhcP1J1dRw1gHn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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