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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ebd493e17ab530fb9ef4d3f43bc167783ea351a2a0a9890e4d616e1efb6e61' 
  AND token = 'glqelrHS+IFEDM+2oVHGXJUuPqQtbWN7FcVcMVvp25I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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