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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a64f248fc4d39f39023ca69351a30b87347acef6cc08f12378de3f2fea731fd' 
  AND token = 'txud2yTK76tWLkCH56pVlo33whZjKQgh3IDuIimMNZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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