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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc247c2a2eac32cf223208e017ce565cc3832fa9383430cecc6ce62542ac3f91' 
  AND token = 'RL6yghFuI1VG5X8o5ChtWYAfnlgQSC/tbzEaQX+9Blo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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