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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b077ffb3a1baa4a97a4455ffd6517dbb5c5dc5aa1b8483c985bba73357503ef' 
  AND token = 'L2FRVYsO+jckWYM+AO4VY/Zo9yfhfDaq+DGuUKJ1bh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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