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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bec1964915aad7eb8d98b4c01fa984b017ece5c19ff90a0333729cf95801bea' 
  AND token = '/9Uj/PGTccSw45t2p2j7bAOgZauoO+CzimJ/cu0UdX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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