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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3f3855b4f8764fb859c0c1089d72ac4f84ccd254f3b2ca064f939bd6d2b80b' 
  AND token = 'jlMoqHERhg8WYl4aC3uE930k7KMTFb+sXosM6MyqcYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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