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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165ebc14c750386eebc9dc9467832572e1ef6e9f47219cb31e8a1257f6cae622' 
  AND token = 'TtwWP+C1Iz8sdRFBqnkJ5ODkfYJGLWTUrssDqyq3BFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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