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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e262abc5550ee53441bc5d1f5d0bd290a4292ded66f2de7c7c45065cd6d8ab8' 
  AND token = 'TPQ/fJSQFvrNJogYM8CaAs2e3OIQYIDPR4BEB90Wty0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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