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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a694c11c5c375eb4acf909ea1d2197909d7bbad4c409dfe1deb1729cf181f2f' 
  AND token = 'CPjOLu/F1IoxaSJxKMT9ZLPG3DqI3ZW4FzKeju0I4Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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