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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca978cdc0f3cb8973c7ea639a1a7e7264f805959dc853872d23345fa1450415' 
  AND token = '/2iq7ZzNP23llASjvB+lfo9kRtIdx/pa7vLDMyuQEys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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