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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb921ed263ba0ee1b5463bc714d46ed9ade0191b589a02ab31413784a8034f30' 
  AND token = 'aEtf2+i5QcwdJnqY/iVICPypctTgw3lt2BwJi/FNqZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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