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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b6ea1dd4934a78e23a1eb6a1ef47188a2e27d2f550277611648d3cf6cb143e' 
  AND token = 'tb4bJN7k85ahuskWXZ6t3eFeAmxoLIfhsRQ93FTuBzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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