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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696ad582d43a21d7ff6274f1e1faff1f3d38b354850df0b1dfdb888bf8c7e4a' 
  AND token = '7XasMAx4cha8iOZAz5iyoD5JbmlTbE06So2JrtP68KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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