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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a314294916fc5beec4d0f5d82ea70aa57a2241f7e1db7f974f235fe7d15f5da8' 
  AND token = '04d3c6sgGQPNO5SB5kgmy33gr1/JxuU1PuGzn90lbUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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