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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e24345e3ba1400c33fe4f8a1f215e1c109f1a631fcd8345c0d60a25b4862b' 
  AND token = 'Cakufzy6vdx2fNWAzz2OaR8V0GhI24z+nKNZxtrAH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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