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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650d5cc7928a7139022a0d481343a16767e9d69ccbec7bb068e9f9f8e0370f7c' 
  AND token = 'frgCtWiAL2IIHgcmdjV50hR1yxvWI7zMjNm9igY3R14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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