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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3846c1901e532f85f3232148322dacc97969715e65adfd293944828d13381246' 
  AND token = '8wgwJ995G8BECVV6Hlm/es/uuz/S2LkzyJKyAdUH3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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