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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d3ebcc4facae75a3792e6d0fbfd8e0ac90ea40354f65ae64fb3ca3280facf1' 
  AND token = 'Wc2+TRxEESZC2NsDwD6zlLECUk7wYAWBKl3yujUE7i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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