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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632a3ef84f98ffca0e1aeb1fe0ee114589a50d907eca5f6b65c4234507272626' 
  AND token = '2hgVy+qGvLK6nIova7AMAUvpMZbZ4ZMmICqFV5cyoqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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